Watch out, Wall Street: 27 tech IPOs to expect in 2015

Investors got plenty of new technology companies to pour their money into last year. Companies that have gone public on U.S. markets include Alibaba, Arista, Castlight, GoPro, Hortonworks, HubSpot, Lending Club, New Relic, and Zendesk. And plenty others should be arriving in 2015. A new group of tech companies have joined CB Insights’ Billion Dollar Club thanks…